Merge pull request #872 from anamika23428/my_new_branch

eval function

contrib/advanced-python/eval_function.md

@@ -0,0 +1,75 @@
+# Understanding the `eval` Function in Python
+## Introduction
+
+The `eval` function in Python allows you to execute a string-based Python expression dynamically.  This can be useful in various scenarios where you need to evaluate expressions that are not known until runtime.
+
+## Syntax
+```python 
+eval(expression, globals=None, locals=None)
+```
+
+### Parameters:
+
+* expression: String is parsed and evaluated as a Python expression
+* globals [optional]: Dictionary to specify the available global methods and variables.
+* locals [optional]: Another dictionary to specify the available local methods and variables.
+
+## Examples
+Example 1:
+```python
+result = eval('2 + 3 * 4')
+print(result)  # Output: 14
+```
+Example 2:
+
+```python
+x = 10
+expression = 'x * 2'
+result = eval(expression, {'x': x})
+print(result)  # Output: 20
+```
+Example 3:
+```python
+x = 10
+def multiply(a, b):
+    return a * b
+expression = 'multiply(x, 5) + 2'
+result = eval(expression)
+print("Result:",result)  # Output: Result:52
+```
+Example 4:
+```python
+expression = input("Enter a Python expression: ")
+result = eval(expression)
+print("Result:", result)
+#input= "3+2"
+#Output: Result:5
+```
+
+Example 5:
+```python
+import numpy as np
+a=np.random.randint(1,9)
+b=np.random.randint(1,9)
+operations=["*","-","+"]
+op=np.random.choice(operations)
+
+expression=str(a)+op+str(b)
+correct_answer=eval(expression)
+given_answer=int(input(str(a)+" "+op+" "+str(b)+" = "))
+
+if given_answer==correct_answer:
+    print("Correct")
+else:
+    print("Incorrect")
+    print("correct answer is :" ,correct_answer)
+
+#2 * 1 = 8
+#Incorrect
+#correct answer is : 2
+#or
+#3 * 2 = 6
+#Correct
+```
+## Conclusion
+The eval function is a powerful tool in Python that allows for dynamic evaluation of expressions.

contrib/advanced-python/index.md

@@ -10,3 +10,4 @@
 - [Protocols](protocols.md)
 - [Exception Handling in Python](exception-handling.md)
 - [Generators](generators.md)
+- [Eval Function](eval_function.md)